Fluke 6080A - RF Output Tests 6-32.; Pulse Modulator Tests 6-33.; Filter Tests 6-34.

TROUBLESHOOTING AND REPAIR
RF Output Tests 6-32.
The RF Output Tests (see Table 6-11) verify the presence of an RF signal at the output
of the Attenuator/RPP assembly. The sensitivity of the RPP detection circuitry is
increased so that it can be used as a RF signal detector. The first test programs a high
RF level at a frequency in the fundamental frequency band and expects the RPP
indicator to trip. The second test programs a high RF level at a frequency in the HET
frequency band and expects the RPP indicator to trip. The third test programs a level
below the detector threshold and expects that the indicator will not trip.
Table 6-11. RF Output Tests
Pulse Modulator Tests 6-33.
The Pulse Modulator Tests (see Table 6-12) configure the RPP circuitry to its high
sensitivity mode as in the RF output tests. The first test programs a high RF level and
enables internal pulse. The internal modulation oscillator sends a steady logic "low" to
the pulse modulator; therefore, the pulse modulator will attenuate the RF output, and
the RPP indicator will not trip. The second test configures the mod oscillator to send a
steady logic "high" to the pulse modulator; therefore, the pulse modulator will not
attenuate the RF output, and the RPP indicator will trip.
Table 6-12. Pulse Modulator Tests
Filter Tests 6-34.
The Filter Tests (see Table 6-13) verify the selection and operation of each of the output
filter and divider sections. The first 12 tests program a frequency within the band of
interest and programs the correct filter and divider settings. The ALC loop-leveled
indicator should report that the loop is leveled.
The next six tests program filter settings that do not correspond with the programmed
frequency. The ALC loop-leveled indicator should report that the loop is unleveled.
6-12
CODE
334
335
336
RF FREQUENCY
800 MHz
1 MHz
800 MHz
AMPLITUDE
+16 dBm
+16 dBm
+7 dBm
EXPECTED STATE
OF RPP INDICATOR
Tripped
Tripped
Not Tripped
CODE
337
338
RF FREQUENCY
800 MHz
800 MHz
AMPLITUDE
+16 dBm
+16 dBm
PULSE CONTROL
LOGIC LEVEL
Low
High
EXPECTED STATE
OF RPP INDICATOR
Not Tripped
Tripped